.net - 如何在模拟 Windows 服务时调用 net.pipe(命名管道)WCF 服务

Question

我在使用 C# Windows 服务中的 Windows 模拟通过 net.pipe 调用 WCF 服务时遇到问题。

背景

该服务从队列中读取并创建子应用程序域，每个子应用程序域针对从队列中拉出的项目运行特定的模块。我们将 Windows 服务称为“JobQueueAgent”，将每个模块称为“Job”。今后我将使用这些术语。可以将作业配置为以指定用户身份运行。我们在作业的应用程序域内使用模拟来实现此目的。 以下是服务中的逻辑和凭证流程:

JobQueueAgent(Windows 服务 – 主用户)>> 创建作业域 >> 作业域(应用程序域)>> 模拟子用户>> 通过模拟在线程上运行作业 >> 作业(模块-子用户)>>作业逻辑

“主用户”和“子用户”都是具有“作为服务登录”权限的域帐户。

该服务在运行 Windows Server 2012 R2 的虚拟服务器上运行。

以下是我正在使用的 C# 模拟代码:

namespace JobQueue.WindowsServices
{
    using System;
    using System.ComponentModel;
    using System.Net;
    using System.Runtime.InteropServices;
    using System.Security.Authentication;
    using System.Security.Permissions;
    using System.Security.Principal;
    internal sealed class ImpersonatedIdentity : IDisposable
    {
        [PermissionSetAttribute(SecurityAction.Demand, Name = "FullTrust")]
        public ImpersonatedIdentity(NetworkCredential credential)
        {
            if (credential == null) throw new ArgumentNullException("credential");

            if (LogonUser(credential.UserName, credential.Domain, credential.Password, 5, 0, out _handle))
            {
                _context = WindowsIdentity.Impersonate(_handle);
            }
            else
            {
                throw new AuthenticationException("Impersonation failed.", newWin32Exception(Marshal.GetLastWin32Error()));
            }
        }
        ~ImpersonatedIdentity()
        {
            Dispose();
        }
        public void Dispose()
        {
            if (_handle != IntPtr.Zero)
            {
                CloseHandle(_handle);
                _handle = IntPtr.Zero;
            }
            if (_context != null)
            {
                _context.Undo();
                _context.Dispose();
                _context = null;
            }
            GC.SuppressFinalize(this);
        }
        [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool LogonUser(string userName, string domain, string password, int logonType,int logonProvider, out IntPtr handle);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool CloseHandle(IntPtr handle);
        private IntPtr _handle = IntPtr.Zero;
        private WindowsImpersonationContext _context;
    }
}

问题

某些作业需要对服务器上运行的另一个 Windows 服务进行 net.pipe WCF 服务调用。在模拟下运行时，net.pipe 调用失败。

这是我在这种情况下遇到的异常:

Unhandled Exception: System.ComponentModel.Win32Exception: Access is denied

Server stack trace: at System.ServiceModel.Channels.AppContainerInfo.GetCurrentProcessToken() at System.ServiceModel.Channels.AppContainerInfo.RunningInAppContainer() at System.ServiceModel.Channels.AppContainerInfo.get_IsRunningInAppContainer() at System.ServiceModel.Channels.PipeSharedMemory.BuildPipeName(String pipeGuid)

当不在模拟下运行时，net.pipe 会成功。当模拟用户添加到管理员组时，net.pipe 调用也会成功。这意味着用户需要一些权限才能在模拟状态下进行调用。我们无法确定用户在模拟时进行 net.pipe 调用所需的策略、权限或访问权限。将用户设置为管理员是 Not Acceptable 。

这是一个已知问题吗？用户是否需要特定的权利才能成功？我可以更改代码来解决此问题吗？ Using WCF's net.pipe in a website with impersonate=true似乎表明由于 NetworkService，这在 ASP.NET 应用程序中不起作用。不确定，但这不应该适用于此。

Answer 1

在 Microsoft 支持的帮助下，我能够通过修改线程标识的访问权限来解决此问题(Harry Johnston 在另一个答案中建议的内容)。这是我现在使用的模拟代码:

using System;
using System.ComponentModel;
using System.Net;
using System.Runtime.InteropServices;
using System.Security.AccessControl;
using System.Security.Authentication;
using System.Security.Permissions;
using System.Security.Principal;

internal sealed class ImpersonatedIdentity : IDisposable
{
    [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
    public ImpersonatedIdentity(NetworkCredential credential)
    {
        if (credential == null) throw new ArgumentNullException(nameof(credential));

        _processIdentity = WindowsIdentity.GetCurrent();

        var tokenSecurity = new TokenSecurity(new SafeTokenHandleRef(_processIdentity.Token), AccessControlSections.Access);

        if (!LogonUser(credential.UserName, credential.Domain, credential.Password, 5, 0, out _token))
        {
            throw new AuthenticationException("Impersonation failed.", new Win32Exception(Marshal.GetLastWin32Error()));
        }

        _threadIdentity = new WindowsIdentity(_token);

        tokenSecurity.AddAccessRule(new AccessRule<TokenRights>(_threadIdentity.User, TokenRights.TOKEN_QUERY, InheritanceFlags.None, PropagationFlags.None, AccessControlType.Allow));
        tokenSecurity.ApplyChanges();

        _context = _threadIdentity.Impersonate();
    }

    ~ImpersonatedIdentity()
    {
        Dispose();
    }

    public void Dispose()
    {
        if (_processIdentity != null)
        {
            _processIdentity.Dispose();
            _processIdentity = null;
        }
        if (_token != IntPtr.Zero)
        {
            CloseHandle(_token);
            _token = IntPtr.Zero;
        }
        if (_context != null)
        {
            _context.Undo();
            _context.Dispose();
            _context = null;
        }

        GC.SuppressFinalize(this);
    }

    [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool LogonUser(string userName, string domain, string password, int logonType, int logonProvider, out IntPtr handle);

    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool CloseHandle(IntPtr handle);

    private WindowsIdentity _processIdentity;
    private WindowsIdentity _threadIdentity;
    private IntPtr _token = IntPtr.Zero;
    private WindowsImpersonationContext _context;


    [Flags]
    private enum TokenRights
    {
        TOKEN_QUERY = 8
    }


    private class TokenSecurity : ObjectSecurity<TokenRights>
    {
        public TokenSecurity(SafeHandle safeHandle, AccessControlSections includeSections)
            : base(false, ResourceType.KernelObject, safeHandle, includeSections)
        {
            _safeHandle = safeHandle;
        }

        public void ApplyChanges()
        {
            Persist(_safeHandle);
        }

        private readonly SafeHandle _safeHandle;
    }

    private class SafeTokenHandleRef : SafeHandle
    {
        public SafeTokenHandleRef(IntPtr handle)
            : base(IntPtr.Zero, false)
        {
            SetHandle(handle);
        }

        public override bool IsInvalid
        {
            get { return handle == IntPtr.Zero || handle == new IntPtr(-1); }
        }
        protected override bool ReleaseHandle()
        {
            throw new NotImplementedException();
        }
    }
}